Pioneer A-77X specifications

Brand : Pioneer

General

Connections

Technical data

Special equipment

Other models of the same series

The interior view with a very strong similarity to that of the A-88X

On the right you can see the shielded phonoplatine

The front without front panel with the controls

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Repair note:

It is located as a "series resistor" in front of the series regulator, which supplies the remaining displays with voltage.

the duration of the performance: 2x 100 watts into 8 643961b8da111c0a15d770a1109a86d4s, 20-20 kHz,
- total harmonic distortion: 0,003 %
dynamic power:
- 8 643961b8da111c0a15d770a1109a86d4: 137 W
- 4 643961b8da111c0a15d770a1109a86d4s: 225 W
- 2 643961b8da111c0a15d770a1109a86d4s: 295 W
total harmonic distortion: 0,003%
cross-distortion factor: 50 Hz:7 kHz at 4:1, in the case of active power to 0.003%
power range: 10 - 100 kHz (Line), 20 - 20 kHz (Phono)
damping factor: 100 (20-20 kHz, 8 643961b8da111c0a15d770a1109a86d4)
input (sensitivity/impedance)
- Phono MM 2.5 mV/ 50 k643961b8da111c0a15d770a1109a86d4s, MC 0.2 mV/ 100 643961b8da111c0a15d770a1109a86d4s
- Line 150 mV/ 30 k643961b8da111c0a15d770a1109a86d4s
output (level/impedance): 150 mV/ 2.2 K-ohms
frequency response:
- Phono: 20-20 kHz ±0.2 dB
- Line: 10-100 kHz +0, -3 dB
tone control
- Bass: ±8 dB (at 100 Hz)
- treble: ±8 dB (at 10 kHz)
Loudness: no
Subsonic: Yes (15 Hz, -6 dB/ octave)
Mute: Yes -20 dB
Direct/Line-Straight: Yes
s / n ratio (short-circuited)
- Phono MM/MC - 88/ 70 dB
- Line 108 dB
stereo channel separation (1 kHz)
- Phono MM/MC - 70/62 dB
- CD/Tuner, AUX 1,2, Tape Play 1,2 - 88/85 dB
speaker impedance: 6 - 16 643961b8da111c0a15d770a1109a86d4s

Phono MM 2.5 mV/ 50 k643961b8da111c0a15d770a1109a86d4, MC 0.2 mV/ 100 643961b8da111c0a15d770a1109a86d4s
Line 150 mV/ 30 k643961b8da111c0a15d770a1109a86d4s

Separate power supplies for each amplifier and the pre-stage, dual-Mono construction
For each channel separate speaker Relays are electronically switched

The models A-77X and A-88X were the then-Elite-amplifiers, the f13e3963c9624dbc775c57d41fbe61ab series, the A-88X has a series of both technical equipment, as well as the performance of led.
The devices probably originated from the predecessors A-60 to A-80, which have quite similar data.
All models (starting with the A-66X) have "of course" metal fronts and metal controls.
The volume control of the A-88X and A-77X is completely made of metal and is attached to the potentiometer axis with a grub screw (on later A-77X, however, the button is only plugged onto the groove axis of the potentiometer.)

If the red light-emitting diodes are no longer lit and the green ones are only dimly lit, then the power light bulb in the green rubber above the main switch has probably burned out (12V , 0.1A).

Pioneer A-77X